Problem with Plexi finish

[cbatzi01]

Hi,

I have started experimenting with a plexiglass finish, and get a lot of "pitting" on the surface. These are tiny pin prick size, but they get clogged with plastic polish, and look awful. Without the polish, they look like little air bubbles, but aren't.

Here is my process:

1. My plexi is thick, like room temp maple syrup, but not quite.
2. 3 dips in plexi with about 1hr in between each dip to ensure it dries without trapping moisture and blushing like lacquer (DAMHIKT)
3. knock it back with 320grit
4. dry sand 400 grit
5. slow down to lowest speed and wet sand 400, 600, 800grit
6. wet sand with micromesh to 12K
7. Novus 2 plastic polish

Should I be sanding it down a bit more to get rid of the pits? do you think they are just air bubbles that I am sanding into?

Thanks!
Chris

 

[PenMan1]

I had a similar issue. It turned out to be that I was using a too thick "working" solution of plexi. When I thinned my "syrup thick" solution with acetone and made it thinner, the "bumps" went away.

I have heard of others using the "gold mesh" reuseable filter that comes with coffee makers to do a final strain of the plexi working solution, but I have never done this.

By the time I got all the kinks worked out with plexiglass, I found it easier to just use CA, so I finally gave up on the process.